Expansion-pulley



(No Model.)

B. J. RILEY.

EXPANSION PULLEY.

Patented Sept. 20, 1887.

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NTTE STATES PATENT EETcE.

EXPANSION-PULLEY.

SPECIFICATION forming part of Letters Patent No. 370,087, dated September 20, 1887.

Application filed June 24, 1887.

T0 all whom it may concern.'

Beit known that I, BERNARD J. RILEY, a citizen of the United States, residing at North Walpolein the county of Cheshire and State of New Hampshire, have invented new and useful Improvements in Expansion -Pulleys, of which the following is a specification.

Hy invention relates to improvements in expansion-pulleys; andit consists in the construction and arrangement of theparts of the same, which will be more fully hereinafter described, and pointed out in the claims.

The object of my invention is to provide a pulley which is adapted to be expanded and by means of which the speed may be increased or decreased, as may be desired, by adjusting the said pulley and increasing its diametric cross-section. I attain this object by the devicel illustrated in the accompanying drawings, wherein like letters of reference indicate similar parts of the several views, andl in which Figure l is a perspective view of my improved expansion-pulley, shown as adjusted to smallest diametric cross-section. Fig. 2 is a side elevation of my improved pulley, shown expanded. Fig. 3 is avertical cross-sectional view of my improvement. Fig. 4 is a front elevation of the inner face of the adjustingdisk. Fig. 5 is an enlarged elevation of a portion of one of the adjusting spoke-connections.

A indicates the hub of the wheel, Which'is of any preferred form of construction, and is formed with a series of radial arms, A', constructed with slots a and with overlying shoulders c. Engaging with the said arms A are a series of sections, B, which consist of the arms b, provided with sectors b, said arms being received by and moving in the slots formed in the radial arms A. These rims b are formed with such a degree of curvature that when they are united they form a solid periphery. At the lower portion ofthe arms b two lugs, b2, are formed and arranged in the same position on each arm. These lugs b2 project outwardly from the said arms band beyond the shoulders formed with the radial arms A. When the sectional pulley, as thus described, has been mounted on the shaft S, an adjusting-disk is also mounted on said shaft adjacent to the side of the sectional pulley from which t-he lugs b2 project. This adjusting-disk C consists, essentially, of a plain central plate having a rim integrally formed therewith, which rim C may be used for turning the disk entire; or suitable handles, c, may be mounted therein at right angles thereto for the same purpose of adjustment. The inner face of the center plate of the disk C is formed with a spiral Way, c', which consists ol' a rib integrally formed at this portion of the disk and projecting outwardly therefrom. This spiral formation is constructed with such nicety that when thelugs b2 on the sections B are in engagement therewith the said sections will be .equally adjusted radially from the center of the pulley. This adjustment is accomplished by turning the adjusting-disk C, and the lugs Z22 being in engagement with the spiral way c the said sections B will be equally expanded from the center of the wheel. When the said disk C is mounted on the shaft S,it is keyed securely in contact with the pulley by means of a collar, s, having a clamping-screw, s', passing therethrough and engaging with the shaft S. Upon the opposite side ofthe said pulley and adjacent thereto another clamping-collar, si, is secured upon the shaft S, and in like manner is provided with a clamping-screw, s3, the construction of the said collar being readily understood by those skilled in the art.

My improved expansioapulley can be used to advantage in many classes of machinery where it is desired to suddenly change the speed, and by my construction such operation is rendered convenient and accomplished without loss of time.

The novelty and utility of niyimproved device being obviously apparent and appreciaj ble, it is unnecessary to further enlarge upon the same herein.

It is obvious that many changes in the construction and arrangement ol" the parts of my improved expansion-pulley might be made and substituted for those shown and described without in the least departing from the nature and principle of my invention.

Having thus described my invention, I claiml. The combination of the hub A, provided with the radial arms A', having the slots a and ICO the overlying shoulders a', the sections B, Way c directly engaging with the lugs J, and formed by the arms b, having lugs b andthe the clamping-collars and their screws, subcircular rims b', and the disk O, having the stantially as described. ispiraLWay c' directly engaging with `the lugs In testimony that I claim the foregoing as 15 5 b2, and adapted upon rotation to simultaneously my oWn I have hereto affixed my signature in move all the arms, substantially as described. presence of two Witnesses.

2. The combination of the'hub A; provided with the radial arms A, having the slots a and the overlying shoulders a', the sections Bf xo formed by the arms b, having lugs bl and the circular rims b, the disk C, having the lspiral BERNARD J1 EILEY.

Witnesses:

GEO. A. WEsToN, HENEYC. LANE. 

